1000000% this is the messaging that resonates best for Giving Green donors, also precisely for the reasons you named. We did a bit of qualitative user research and persona work a few years ago on this, and it still continues to be a core theme with new donors (who range from EA-adjacent to classic environmentalist). I don’t have anything useful to add, just here to corroborate!
edit: ok I have one useful thing to add, which is that, especially because of the type of work we fund, we explicitly don’t use “certain impact” or “best charity” framing. but “certainty in giving” is different from “certainty in impact”!
1000000% this is the messaging that resonates best for Giving Green donors, also precisely for the reasons you named. We did a bit of qualitative user research and persona work a few years ago on this, and it still continues to be a core theme with new donors (who range from EA-adjacent to classic environmentalist). I don’t have anything useful to add, just here to corroborate!
edit: ok I have one useful thing to add, which is that, especially because of the type of work we fund, we explicitly don’t use “certain impact” or “best charity” framing. but “certainty in giving” is different from “certainty in impact”!